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PicŪ Basic
You can use any pin available on the PICŪ (except the Vpp = Programming pin), and what you need to test is a simple routine
Code:
TEST:
PortA,0 = 1 ' Switch PICŪ pin On
Delayms 500 ' Half second delay
PortA,0 = 0 ' Switch pic pin Off
Delayms 500 ' Half second delay
Goto TEST ' Repeat over and over
Now you know the following -
The PICŪ is running (phew !)
The PICŪ clock rate is set correctly
Code timings is going to work out
If the PICŪ clock was set incorrectly, the flash rate will be either too fast or too slow.
If you don't get the LED to flash, then check the PICŪ supply voltage, if ok
then check the configuration settings, especially the clock source, ie Internal Osc, XT, etc.
If you're using an Xtal or other external clock, it may be easiest to start by using the internal clock,
if the PICŪ is running then,
you know the only problem is either the external oscillator or the configuration clock source.
If the flash rate is incorrect, then the clock is either specified wrong or the oscillator settings is incorrect.
Consult the PDF file for the specific PICŪ to set it right.
PICŪ are easy to get going, if they don't it's usually a small (but important) overlook somewhere.
Using PDS with SPI GLCD based on ST7565R Controller
Graphic LCDs based on the ST7565 are cheaper then GLCDs with other controllers. SPI requires only four pins. If the circuit